Drier for photographic prints.



HQG. RYDHOLM.

DRIER FOR PHOTOGRAPHIC PRINTS.

APPLICATION FILED NOV. I8, 19H.

1,187,102. Patented June 13, 1916.

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' THE COLUMBIA PLANOGRAPH cm. WASMINGTON. n. c.

HENRY G. RYDHOLM, or SAUK CENTER, MINNESOTA.

DRIER FOR PHOTOGR-APHIC PRINTS.

Specification of Letters Patent.

Patented. June 13, 1916.

Application filed November 18, 1914. Serial No. 872,732.

said device at the same time providing means for withdrawing the heat from the room so that the same may be used with comfort and satisfaction in warm weather.

The full objects and advantages of my invention will appear in connection with the detailed description thereof and are par ticularly pointed out in the claims.

In the drawings, illustrating the application of my invention in one form, Figure 1 is an elevation view of the complete drier.

Fig. 2 is a sectional elevation of a portion of the parts shown in .Fig. 1 on a larger scale and taken on line 22 of Fig. 1. Fig. 3' is a top plan view with the cover removed and some of the parts broken away.

As illustrated, I provide an outer cylinder 10 secured to legs 11 by which the same is held spaced from the floor a proper distance, a table 12 providing a support for a heater 13, such as an oil or gas burner. Within cylinder 10, and held in proper relation thereto by means of securing members 14;, is the drier cylinder proper 15. The cylinder 10 has its lower outwardly-rolled edge 16 at a point somewhat lower than the outwardly-rolled edge 17 of cylinder 15; and between the cylinder walls is an annular space 18. Secured to inner cylinder 15 at a point suitably raised above the lower rolled edge 17 thereof by crossed brace bars 42 is a partition or diaphragm 19, which is formed of imperforate material, preferably sheet metal, excepting for a series of semicircular apertures 20 between the peripheral edge of said dia phragm and the inner cylinder wall of cylinder 15. There does not needto be any set number of said apertures 20, but in practice these may conveniently be fixed at four, so that there will be four such open spaces 20 and four intervening closed portions of the diaphragm adjacent the cylindrical wall, all as clearly shown in Fig. 3. Held properly spaced above the diaphragm 19 secured to cylinder 15 by crossed brace bars 43 is a second diaphragm 21 having an upper covering 22 of asbestos or other suitable insulating material. The diaphragm 21 is likewise provided with a series of peripheral. apertures 23 similar to apertures 20 and staggered in respect thereto, so that apertures 20 open upon an imperforate portion of the diaphragm 21; The diaphragm 21 also has a series of smaller circular apertures 24 at the central part thereof. A cover 25 fits over the top of the outside cylinder and closes the same from the air of the room. The pipe 26 connects with the inner cylinder 15, while another pipe 27- connects with the outer cylinder 10, these pipes uniting in a common pipe 28 which maybe connected with a chimney flue.

In operation the roll of wet print placed on end upon the insulated surface 22 of the upper diaphragm 21 and the cover 25 closed over the apparatus. The flame of the burner 13 strikes upon the bottom of the imperforate diaphragm 19 andspreads out over said bottom, the hot gases passing through the peripheral apertures 20.. After these gases pass through apertures 20 they strike upon the imperforate portions of the diaphragm 21 and spread over the surface thereof, finally passing through the peripheral apertures 23 and the central apertures 24, where said gases may pass through all parts of the print roll within the cylinder 15, finally escaping through the pipe 26. Any gases or heated air which do not pass within and through the cylinder 15 will enter the annular passageway between the walls of cylinders 15 and 10 and be carried to pipe 28 through pipe 27. This keeps the outer wall of cylinder 10 comparatively cool and perfects the escape of heat from the drier into the studio room, and also carries off all the gases of the burner. If, however, it were desired to throw said gases into the room for heating the same, or for any other purpose, dampers 29 in the pipes 26 and 27 might close said pipes and the cover 25 be removed, in which case all the gases and surplus heat of the burner would pass into the room. Cylinder 15 may be provided with a cover 45 which in conjunction with the damper 29 in pipe 26 can prevent the escape of gas from said cylinder and so in vertical produce a greater degree of temperature Within said cylinder.

I claim:

1. A drier for photographic print rolls, comprising a pair of concentric cylinders with an annular space between the walls thereof, means for supporting said cylin ders in vertical position, means for supporting a burner below said cylinders, means for withdrawing the gases of combustion from both of said cylinders, means for supporting the photographic print so as to permit the heated air and gases from the burner to pass through the print, and means for first deflecting said gases before they enter said cylinders so that they will be spread and of uniform temperature before passing through the roll of print.

2. A drier for photographic Print rolls, comprising a pair of concentric cylinders with an annular space between the walls thereof, means for supporting said cylinders position, means for supporting a burner below said cylinders, means for withdrawing the gases of combustion from both of said cylinders, an insulated support for the photographic print having openings therein such asto permit distribution of the heated air and gases from the burner to all parts of the print, and means for first deflecting said gases before they enter said cylinders so that they will be spread and of uniform temperature before passing through said openings.

3. A drier for photographic print rolls, comprising a pair of concentric cylinders with an annular space between the walls thereof, means for supporting said cylinders in vertical position and for supporting a burner below the same, means for withdrawing the gases of combustion from both of said cylinders, and a pair of horizontal partitions spaced from one another in and adjacent the bottom of the inner cylinder, said partitions being formed'with openings adjacent the junction of the partitions with the cylinder wall, said openings being in staggered relation so that the heated air and gases from the burner will be deflected and spread and of uniform temperature before passing through the inner partition.

4-. i Ldrier for photographic print rolls, comprising a pair of concentric cylinders with an annular space between the walls thereof, means for supporting said cylinders in vertical position and for supporting a burner below the same, means for withdrawing the gases of combustion from both of said cylinders, and a pair of horizontal partitions spaced from one another in and adj acent the bottom of the inner cylinder, said partitions bein formed with openings adjacent the junction of the partitions with the cylinder wall, said openings being in staggered relation so that the heated air and gases from the burner will be deflected and spread and of uniform temperature bgfore passing through the inner partition, said inner partition being provided with interior apertures and having an insulating covering for the reception of the roll of print.

In testimony whereof I affix my signature in presence of two witnesses.

" HENRY s. RYDHOLM.

Witnesses:

CARY DI-EHL, L. C. MnYERs,

topics of this patent may be obtained for five cents each, by addressing the Commissioner of atents Washington, D. G. 

